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A New Technique for the Determination of the Critical Current Density in Superconducting Films and Flat Samples

McLoughlin, Conor and Bernstein, Pierre and Thimont, Yohann and Siejka, Julius A New Technique for the Determination of the Critical Current Density in Superconducting Films and Flat Samples. (2013) Journal of Superconductivity and Novel Magnetism, 26 (5). 1495-1498. ISSN 1557-1939

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Official URL: https://doi.org/10.1007/s10948-012-1964-8

Abstract

The determination of their critical current density in the whole range of the temperature below T c is of first importance to understand the physical processes occurring in superconducting films. We describe here a technique suitable for square films based on the measurement of the magnetic moment due to the currents persisting in the superconductor after the application of a perpendicular high magnetic field. Typically, with a 1 K interval between two measurements, using a SQUID magnetometer the measurement time is of 2 hours only by this technique. An intriguing aspect of the obtained results is that they are much more accurate if the current lines are supposed to be circular than if we suppose, as suggested by theoretical considerations and magnetooptical observations that they have the sample symmetry.

Item Type:Article
HAL Id:hal-01237466
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Ecole Nationale Supérieure d'Ingénieurs de Caen - ENSICAEN (FRANCE)
Other partners > Université Pierre et Marie Curie, Paris 6 - UPMC (FRANCE)
Other partners > Université de Caen Basse-Normandie (FRANCE)
Other partners > Dublin City University - DCU (IRELAND)
Other partners > JAS Conseils, Paris (FRANCE)
Laboratory name:
Funders:
Irish Research Council for Science, Engineering and Technology
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Deposited On:28 Oct 2019 13:24

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